Abstract
In order to investigate the interrelations of crust and upper mantle tectonics and its velocity distribution as well as seismicity in the Yanhuai basin and its surrounding area, a nearly EW-trending Beijing-Huailai-Fengzhen wide angle reflection/refraction profile, which obliquely passes through seismic zone of Zhangjiakou-Bohai Sea and coincides with a deep reflection profile in the Yanhuai basin, was completed recently. The results show: The crust presents layered structures and its thickness gradually increases from 35.0 km in Shunyi to 42.0 km in the west end of the profile; the interior crustal interfaces appear approximately horizontal or slowly sloping down from east to west; In the Yanhuai basin, the crust presents the characteristics of higher velocities alternating with the lower ones and the low velocity bodies obviously exist in the lower part of upper crust. Moreover, there are two deep crustal fault zones which stretch to the Moho-discontinuity, are closely related with the seismicity in the Yanhuai area.
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This subject is supported by the key project during “The 8-th Five-Year Plan” from the State Science and Technology Commission of China.
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Zhu, ZP., Zhang, XK., Zhang, JS. et al. Study on crust-mantle tectonics and its velocity structure along the Beijing-Huailai-Fengzhen profile. Acta Seimol. Sin. 10, 615–623 (1997). https://doi.org/10.1007/s11589-997-0025-z
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DOI: https://doi.org/10.1007/s11589-997-0025-z